Each person on a team brings a unique perspective to the process; i.e., how things work; what happens when changes are made, and how to sustain improvements during daily work. Contributions are made from each individual's skill set and the team's synthesis of ideas.
Division of labor is the economic term for the practice of assigning small parts of a complicated job to individual workers who specialize in doing just their small part.
The question that I posed as the title of this article is very easy to answer; incredibly important. As I have documented in the past, the small business is the most important cog in the United States economy, after consumer spending.